Oop, looks like Ukraine is working north-west through the Kursk Oblast, about to take a small town that sits on the E-38 motorway between Kyiv and Moscow. I'm not sure what Putin thinks he's doing here by failing to reinforce or even respond to these border incursions. I mean, we know he doesn't care about Russian citizens but you'd think he'd put a little bit of effort into pretending.
Kursk Oblast is 7-8 hours drive from Moscow. Rylsk is just over an hours drive from Kursk nuclear power plant. Kursk is 2 hours drive north from Belgorod, which is a staging area for the Russian army. The populations of these places aren't high, somewhere between 250-350k people. With any other country, there wouldn't be the resources to push forward. But with Russia, there's no civilian defence, no army reserves, and lots of empty space to burn through.